PART 2: CX-Server PLC Tools
OMRON
CHAPTER 5 – Data Trace/Time Chart Monitor Component
CX-Server PLC Tools_Page 39
CHAPTER 5
Data Trace/Time Chart Monitor Component
This chapter describes the Data Trace/Time Chart Monitor component and its ability to display either the PLCs
uploaded data trace buffer or monitored data obtained from the PLC’s memory areas during program execution.
Data held in a PLC’s memory areas can be monitored and traced during program execution. When displayed,
this information provides a valuable tool for analysing the program’s performance.
The Data Trace/Time Chart Monitor component has two separate modes of operation:
♦
Data Trace
. The PLC can be configured to trace a number of channels and bits and can sample these when
a trigger condition is activated. When the PLC trace buffer is full or the user stops the trace, the trace
buffer can be uploaded and viewed – the trace however, is complete. Values do not change on the screen,
all sampling is achieved in the PLC and displayed when finished.
♦
Time Chart Monitor
. A number of channels and bits can be configured and monitored online. The
changing values are displayed in the monitoring view as either a trend graph or histogram. A trigger
condition can also be set which resets the sampled amount of data. Monitoring continues until stopped by
the user.
The status bar provides instant help, the PLC and CPU type, the current operating mode of the PLC and the
status of the Data Trace/Time Chart Monitor component.
The Toolbar and status bar can both be turned on or off. Select
Status Bar
from the
View
menu to control the
display of the status bar. Select
Toolbar
from the
View
menu to control the display of the Data Trace/Time
Chart Monitor toolbar.
The Data Trace/Time Chart Monitor component can be forced to stay as the top window by selecting the
Always
on top
option from the
Options
menu.
For moving, resizing, maximising, minimising and closing windows, refer to Microsoft Windows online help.
Access to the Data Trace/Time Chart Monitor dialogue is from the invoking application.
To close the Data Trace/Time Chart Monitor dialogue, select the
Close
button in the title bar.
Sampling Ranges
The following paragraphs discuss sampling ranges specific to PLC series.
CS1-series PLC Sampling Range
The CS1-series PLC can trace a maximum of 31 bits and 6 words and performs data tracing using one of the
following methods:
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